Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dbe38208f0e80b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 02:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 442a7a8f5ce4f967b07f058db6146c76 SHA-1: c071fb68d1e80cf9323c30432db266168f0b8214 SHA-256: 27dbe38208f0e80b728035d5e679f2f6e7c8ca12759ed60357bc3342f74a42ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely exploiting the 'wkhtmltopdf' tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://afritransport.com/app/webroot/files/file/lizatijedelupanow.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161380cbf2c809---favazajotamifebivotewaxar.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/66999982687.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/sanemetevurowisi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/44027401626.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/zuwap.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/78081529428.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614456e593912---41904191918.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/37372270477.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/38517440606.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/duzizozedewugejoda.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/6076863862.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/xorarepoxasaxamilafewi.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/25148341457.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/72129760041.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/relamezowixizixojinu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///wiselolowosutufaburilivof.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/mosikexizataguxun.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/50852722718.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/xujuji.pdfIn PDF document text
    • http://rubensova16.cz/files/file/67815726070.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b7218031f588628925b2967494d90b51/4089289621.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/45772643385.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/zaguxijesexibuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+android+republicPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 14568 bytes
SHA-256: a4483f802247c3ed5947b3724d34949127bd84343a1a0d251af14a1aa0843f14
font_02_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 10568 bytes
SHA-256: 20ca915261c27ba1eb6057cb0aaec179cfee88ffedd8ee346cdee44e1785f9ca

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